Abstract: In order to promote the cultivation of bamboo-willow in constructed wetlands in arid areas of Xinjiang,in this experiment,the potted bamboo-willow seedlings were taken as the object,and five water treatment gradients were set up,which were flooding,wet,moderate,dry and extremely dry.Through the measurement of growth,physiological indexes and observation of cell morphology of bamboo-willow under different water conditions,the effects of water stress on the growth of bamboo-willow were studied.The results showed that:with the extension of water stress time,the bamboo-willow in the flooding group took root by air,and the leaves became yellow and slender.The leaves in 21 dand 30 dgroups were curled and fell off,and the branches shrank and dried.The survival status of the three and seven day groups was the best.The cell membrane permeability and MDA content of each treatment showed flooding ＞3 d＞7 d＞21 d,indicating that long-term drought stress will destroy the biofilm structure of bamboo-willow.The best survival state of bamboo-willow was to keep the soil moisture content in the range of 15.5%-53.5%.